Research, Statistics, Data & Systems

Data & research

Learn about the data, systems, and research behind the programs that provide health coverage to more than 100 million people.

Popular for students and researchers

Photo of healthcare worker at desk with laptop and printed reports

Data.CMS.gov

Access data about CMS programs

Access data

Photo of woman sitting while doctor reads information from a chart

Data.Medicaid.gov

Access data about Medicaid and CHIP

Visit site

Photo of healthcare worker in PPE looking at a sample in a lab

Provider Data Catalog

Access data about Medicare Providers

Explore catalog

a woman views a chart on a computer

ResDAC

Learn about CMS data for research and request Research Identifiable Files (RIFs)

Learn more

CMS Data

Data Disclosures and Data Use Agreements (DUAs)
Centers for Medicare & Medicaid Services (CMS) Data Use Agreementssee more
Limited Data Set (LDS) Files
The Centers for Medicare & Medicaid Services (CMS) makes Limited Data Set (LDS) files available to researchers as allowed by federal laws and regulations as well as CMS policy. LDS files contain…see more
Learn More About CMS Data
Overview of CMS Data CMS is the federal agency that provides health coverage to more than 160 million individuals through Medicare, Medicaid, the Children's Health Insurance Program, and the…see more
Types of Data Files
The Centers for Medicare and Medicaid Services (CMS) makes certain data products and data files available to external stakeholders as allowed by federal laws, regulations, and CMS policy.  …see more
Data Available to Everyone
CMS produces a variety of de-identified public data products including public use files, data tables, dashboards, and mapping tools.  These public data products are freely available on CMS’ open…see more
Data Available to Researchers
CMS makes two types of data products available to researchers as allowed by federal laws, regulations, and CMS policy: limited data set (LDS) files and research identifiable files (RIFs). Consistent…see more
Data Available to CMS Contractors
CMS contractors may require access to CMS data to conduct their contracted work. Disclosure of data containing protected health information, personally identifiable information, or other controlled…see more
Data Available to Government Agencies
CMS makes certain data available to other government agencies as allowed by federal laws and regulations as well as CMS policy.CMS has established the following pathways for government agencies to…see more
Data Available to Qualified Entities
Qualified Entity Programsee more
CMS Data Principles and Operating Norms
The CMS Data Principles are a shared set of values for data management at the agency. They establish a foundation that allows CMS to maximize our use of data in decision-making. Each principle is…see more
CMS Plan to Enhance Public Access to the Results of CMS-Supported Research
The Centers for Medicare & Medicaid Services (CMS) Plan to Enhance Public Access to the Results of CMS-Supported Research (CMS Public Access Plan) describes how CMS will take steps to…see more

CMS information technology

Access to CMS Data & Application
CMS Contractor Data Communications Support Policysee more
CIO Resource Library Overview
This webpage provides an overview of CIO documents, including policies, standards, directives, guidelines, and procedures.see more
Database Administration
CMS Database Administration.see more
CMS' Identity Management
CMS' Identity ManagementCMS' Identity Management (IDM) system is an established, enterprise-wide, identity management solution. IDM is leveraged by CMS business applications across the agency…see more
Enterprise Architecture
CMS Enterprise Architecture Strategy Group. EA definition and HHS workgroups that CMS participates.see more
Enterprise IT Investment Management
The CMS Integrated IT Investment & System Life Cycle Framework can be viewed as a hierarchy.see more
HIPAA Eligibility Transaction System (HETS)
The HIPAA (Health Insurance Portability and Accountability Act) Eligibility Transaction System (HETS) allows you to check Medicare beneficiary eligibility data in real-time. Use HETS to prepare…see more
CMS Information Security and Privacy Overview
"Holding Ourselves to a Higher Standard"What is the Information Security and Privacy Group (ISPG)?The Information Security and Privacy Group (ISPG) is within the CMS Office of Information Technology …see more
Section 508 and CMS
overview of section 508see more
SPARC Home
  The Strategic Partners Acquisition Readiness Contract (SPARC) is a cost-effective, innovative solution for procuring information technology (IT) professional services from a pool of CMS…see more
TLC Overview
  Welcome to the Target Life Cycle!TLC OverviewThe TLC is CMS's system development life cycle governance framework that promotes business flexibility and replaces point-in-time gate reviews…see more

Computer data & systems

Electronic Submission of Medical Documentation (esMD)
The Medicare Fee-for-Service (FFS) Compliance programs prevent, reduce, and measure improper payments through medical review. We provide a number of programs to educate and support Medicare…see more
Medicaid Data Sources - General Information
Medicaid Data Sources - General Informationsee more
EMDI Overview
Electronic Medical Documentation Interoperability (EMDI) Program The Centers for Medicare & Medicaid Services (CMS) Electronic Medical Documentation Interoperability (EMDI) Initiative…see more
Medicaid Information Technology Architecture (MITA)
The Medicaid Information Technology Architecture (MITA) pages are currently being migrated to the Medicaid.gov website.  In the interim, please use the following links from the CMS.gov Archive…see more
Minimum Data Set 3.0 Public Reports
Minimum Data Set 3.0 Public Reportssee more
Transformed Medicaid Statistical Information System

Monitoring programs

Improper Payments Measurement Programs
Background The Payment Integrity Information Act of 2019 (PIIA) (Public Law No. 116-117) requires government agencies to identify, report, and reduce improper payments in the government's programs…see more
Medicare Fee-for-Service Compliance Programs
CMS recognizes that it is important for stakeholders to understand how CMS anticipates performing medical review after the Public Health Emergency (PHE) has ended. Below is an FAQ that addresses how…see more
Medicare Advantage Risk Adjustment Data Validation Program
About the ProgramA CMS Strategic Pillar is to protect the Medicare, Medicaid and Marketplace programs for future generations by serving as a responsible steward of public funds. The Medicare…see more
Medicare Part C and Part D Program Integrity
Medicare Part C and Part D Program Integrity overview.see more

Surveys

Welcome to CMS' Alliance to Modernize Healthcare FFRDC
The "Alliance to Modernize Healthcare" Federally Funded Research and Development Center (Health FFRDC).see more
Consumer Assessment of Healthcare Providers & Systems (CAHPS)
The Centers for Medicare & Medicaid Services (CMS) develop, implement and administer several different patient experience surveys.  These surveys ask patients (or in some cases their…see more
Health Outcomes Survey (HOS)
Health Outcomes Survey (HOS)see more
Medicare Current Beneficiary Survey (MCBS)
If you have been contacted to participate in the Medicare Current Beneficiary Survey (MCBS) and would like to verify your selection in this study, please visit our MCBS Respondent Page or contact…see more

Statistics, trends & reports

Comprehensive End Stage Renal Disease (ESRD) Care (CEC) Model Public Use Files
The Comprehensive ESRD Care (CEC) Model was designed to identify, test, and evaluate new ways to improve care for Medicare beneficiaries with End-Stage Renal Disease (ESRD). Through the CEC…see more
Marketplace Products
Marketplace productssee more
Medicare Advantage/Part D Contract and Enrollment Data
The Medicare Advantage (MA) / Part D Contract and Enrollment Data section serves as a centralized repository for publicly available data on contracts and plans, enrollment numbers, service area data,…see more
NCH and MEDPAR Data Dictionary
NCH and MEDPAR Data Dictionarysee more
Next Generation ACO Model (NGACO) Public Use Files
The Next Generation ACO Model is an initiative for ACOs that are experienced in coordinating care for populations of patients. The goal of the Model is to test whether strong financial incentives for…see more
Part B Carrier Summary Data File
Part B Carrier Summary Data Filesee more
Trustees Report & Trust Funds
Annual Reports of the Boards of Trustees of the Medicare Trust Fundssee more
Chief Financial Officer (CFO) Report
CFO Reportsee more
CMS Statistics Reference Booklet
The CMS Statistics reference booklet provides quick summary information about enrollment and expenditures within the Medicare and Medicaid programs.  The reference booklets are available for…see more
Cost Reports
HCRIS Data DisclaimerThe Centers for Medicare & Medicaid Services (CMS) has made a reasonable effort to ensure that the provided data/records/reports are up-to-date, accurate, complete, and…see more
EDI Performance Statistics
Statistical information and reports related to Medicare's implementation of HIPsee more
Health Plans, Reports, Files and Data
Overview page for 8 Medicare Advantage files which contain enrollment and eligible countssee more
Health Care Information System (HCIS) Data File
Health Care Information System (HCIS) Data Filesee more
Insight Briefs
Medicare and Medicaid Insight Briefssee more
MCBS Public Use File
MCBS Public Use Files (PUFs)The Medicare Current Beneficiary Survey (MCBS), sponsored by the Centers for Medicare & Medicaid Services Office of Enterprise Data and Analytics (OEDA) through a…see more
Medicare Claims Synthetic Public Use Files (SynPUFs)
Medicare Claims Synthetic Public Use Files (PUFs)see more
Medicare Fee for Service for Parts A & B
Medicare Fee for Service for Parts A & Bsee more
Medicare Program Rates & Statistics
Medicare, Medicaid, health care rates and statisticssee more
National Health Expenditure Data
National Health Expenditures home pagesee more
Part B National Summary Data File (Previously known as BESS)
Part B National Summary Data File - previously known as BESSsee more
Provider Statistical & Reimbursement Report
Explanation of Provider Statistical & Reimbursement System, including links to manuals and instructionssee more
Report on Conferences Sponsored by CMS
Report On Conferences Sponsored By CMSsee more
Medicare Enrollment Reports
Medicare Enrollment Tables: National, State & Countysee more
CMS COVID-19 Data Products
On January 31, 2020, the U.S. Department of Health and Human Services Secretary declared a public health emergencysee more
Actuarial Studies
Actuarial Studiessee more
Data & Statistical Resources
SPOTLIGHT & RELEASES09/30/2024: (MMCO Statistical & Analytic Reports page)CMS released the revised resource, Defining Medicare-Medicaid Enrollees in CMS Data Sources. 08…see more

Archives

Active Projects Report
Active Project Reportsee more
Data Compendium
This page serves as an archive of the CMS Data Compendium which was published in 2002 and 2003 as well as from 2006 through 2011. The CMS Data Compendium provides key statistics about CMS programs…see more
Health Care Financing Review
This page serves as an archive of the Centers for Medicare & Medicaid Services’ (CMS) Health Care Financing Review (HCFR) journal. The HCFR was released from 1979 and 2009 with the goal of presenting…see more
List of Past Articles
HCFR archivesee more
Medicare & Medicaid Research Review (MMRR)
This page serves as an archive of the Medicare & Medicaid Research Review (MMRR). Between 2011 and 2014, the MMRR published articles and briefs that examined and evaluated health care coverage,…see more
Medicare & Medicaid Statistical Supplement
This page serves as an archive for the Medicare & Medicaid Statistical Supplement which was published annually from 2001 to 2013. The Medicare & Medicaid Statistical Supplement provides…see more
Research Reports
Research Reports Listsee more
Chart Series
Chart Series overviewsee more
Basic Stand Alone (BSA) Medicare Claims Public Use Files (PUFs)
CMS is committed to increasing access to its Medicare claims data through the release of de-identified data files available for public use. These files are available to researchers as free…see more

Find data that has moved

We've moved some of our data pages to CMS Open Data sites. Explore the directory to find content that has moved.

Explore more data

Recent Articles

Visit the newsroom
Visit the newsroom